Cylinder for paper-drying machines



J. E. ALEXANDER. CYLINDER FOR PAPER DRYING MACHINES.

APPLICATION FILED NOV-2E. HIT. 1,348,469.

Patented Aug. 3, 1920.

2 $HEETSSHEET l.

I. E. ALEXANDER.

INDER FOR PAPER DRYING MACHINES.

APPLICATION FILED NOV- 26. I9"- Patented Aug. 3, 1920.

2 SHEETSSHEET 2. Z 1 i UNITED STATES PATENT OFFICE.

JOHN E. ALEXANDER, OF PORTEDWARDS, WISCONSIN.

CYLINDER FOR PAPER-DRYING MACHINES.

Application filed November 26, 1917. Serial No. 204,088.

erence marked thereon, which form a part of this specification.

This invention relates to an electrically heated cylinder for a paper drying machine, the,constructionof said cylinder being comparatively' simpleand adapted to bereadilyl carried out in the reconstruction of steamrollers or cylinders which are-almost um-f p 'f guide rolls;5.

versally used in paper drying-machines; Y

It is an object of this invention to construct an electrically heated drying cylinder for use in paper drying machines.

It is also an object of this invention to provide a drying cylinder for a paper-making machine, said cylinder adapted to be heated by electricity which is permitted to flow through a coiled resistance wire mounted within said cylinder.

It is an important object of this invention to construct a cylinder having a plurality of coils of resistance wire mounted therein formed from a single length of wire. said coils being connected with an electric circuit whereby said cylinder is-heated and adapted forjuse as a drying member in a paper dryinp: machine or other similar device.

Other and further important objects of this invention will be apparent from the disclosures in the specification and drawings.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

n the drawings:

Figure 1 is a side elevational view of a paper drying machine with parts omitted and broken awav. and equipped with elec tricallv heated drying cylinders embodying the principles of this invention.

Fig. 2 is a section taken on line 22, of Fig. 1, with parts in el.evation.-

Fig. 3 is a longitudinal vertical central section taken through one of the cylinders, showing parts thereof in elevation.

Fig. 4 is an enlarged detail section taken on line 4-4 of Fig. 3.

Specification of Letters Patent.

Patented Aug.

Fig. 5 is 'an enlarged. fragmentarydetail sect on taken on line 5-5 of Fig. 1,, with parts broken away. r c i Fig. 6 is a section taken on line. -6;-6 o f Fig. 5. l

Fig. 7 is an enlarged. fragmentary detaif ection taken transversely" through one of the insulating blocks of the heatingcoili As shown onthe drawings I. A

The referencenumeral 1, indicates or foundation 'upon which .is mounted ,a paper drying machine comprising inpartga' framework 2, in which is journaled in suit.- able bearings B, V a} {plurality .of staggered electrically heated drier units or -cylinders, embod mg the principlesrof thisinvention, and a apted a) uniformly. dry a paper web 4, wh chis' guided by means of agiiido belt which 1 Pa s s me d d .ve a

" m d and-between the g o P .P Q11 d ie yh d whereby said webl, is thorong y dried uniformly in ltspassage throughthe. paper dry-- inc: machine.

' Each of thed aimed sateen.

prises a cylindrical casing fifiithp ends. of.

which are beiihipwar'dl to each of whichisrigidly secured by means of bolts 8, or other suitable'fineans, a centrally apertured end plate:9,.fior closingzthe ends ofsaid casing 6.. .,Pi'o iect inglongitu- :linally through the casing firan d out through the central apertures in} the end plates :9, 'is, n shaft or axle 10. Keyed onorptherwise wa s. p ce rigidly secured upon each. projecting end of the axle 10, adjacent' theouter surface of the end plates 9, is ahub 11, having integrally formed at right angles to the. inner end thereof 3 an apertur'e'd flange plate '12, which lies fiat against the outer surfacebf one of the end plates 9, and is to by bolts 13. or other suitablemeans. Each of the hubs 11, has engaged or rigidly secured thereon an insulation band or .ring 14. upon which is securely mounted a contact ring; 15. Rigidly secured .upon thetop of each of the bearinesB, is a small insulating plate 16, unon which issecured a binding post 17. Held in positionlupqnthe insulatine'fplate :16; by the bindingpost 17. is one nd of a spring fimzer 'or contact member 18. the other end of which is curved and bears upon one of the contact rings 15-. ,Com

' fdlyfseeured there i i any corn as i oa bin ia z the opposite end of the drier unit is another lead wire 20. Said wires 19 and 20, are adapted to be connected to a source oi electrical ener y.

As cleariy shown in Figs-3 and 4', an electric heating unit or element is disposed within the casing 6,.and-comprises a plurality of adjacently disposed s iders, each having a hub 21, keyed or otherwise rigidly-secured upon the shaft 10, and a )lurality of radially disposeds idcr arms 2%, the inner ends of which-are integral with the hub 21. Rigidly secured to the contact ring 15, atone end of the drier unit'is' one'end of a resistance wire 23, which is threaded through an. aperture of theresistance wire i23, the opposite end of which projectsou'twardly throu h' a suitableopenin'g in; the 'cndx'of the rier unit :inddsirigidly, secured'tb tl'e contact ring 15, which connects up w'itli he'lead .wire 20.

The coiled wa es, thus forms" an electric heating unitwithin the drier unit, whereby whenifanl' jelectri'c'fcurrefit. is established throughtlie" 'lcad"wires 19 and. 20,-and

through the'he'at'ing'coil's connected in seriestherewith, said coilsbecome heated and'so act to heat the metal cylindefi-cas'ing 6, to afi'ord a means for uniformly drying a paper web which is runthrough the paper drying machine equipped with electrically heated .drier units, as shown in Fig. 1.

The operation is as follows:

The drier units are rotatably journaled in the bearings ii, and may be. rotated by any suitable means To heat the drier units, the circuits to vthe wires 19 and 20, are closed by suitable switches, thus permitting the current't'o'. enter the .drier ,units throu h the wire'19, therespectivebinding' 0st 1 contact members'l8, and contact rings 15, thus connecting u It will, or wuisa'te understood that various ldnds of electric heating elements other thanthetype shown maybe installed within th'e'c'asing-G, and that numerous differ'ent wa s of eonnectin up .said electric heating eme'i ts'with sources of electrical energ i p y. (if, e i drier units as hereinbefore described, it will be seen that large paper-making machines.

with the coiled resistance wire123, "flowlngftherethrough and out of.

at present equipped with steam heated drying' cylinders may have the drying cylinders thereof readily converted-into electric drying cylinders, if so desired, thus reusing parts of the old drying machine and thereby reducing the cost of changing from a steam heated drying system to an electrically heated drying system.

I am aware that numerous details of construction may be varied through a wide range withoutdeparting from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than' necessitated by the prior art.

I claim as my invention:

1. A drier unit comprising a casing, a shaft projecting therethrough to permit said casing to be rotatably mounted, spiders se cured on said shaft within said casing, a plurality of connected flat spirals of wire secured on said spiders, and means con nected with said fiat spirals of wire to permit an electric current to be passed therethroughto heat the same and said casing.

2. In a drier unitjoft the class described embracing a casing, means for rotatably supporting the same, a plurality of electric heating coils within said casing formed from a unitary'piec'e of wire, spiders mounted within said casing forsupporting said coils. and insulating'blocks disposed between said spiders andsaidjcojISL gQ a V 1 3'. Ina drier unit'of the class described, a cylinder, a shaft for rotatably supporting the same, a plurality of supporting mem bers within said cylinder rigidly secured to said shaft, insulating blocks secured in radial rows on said members, electrically heated wire coils within said cylinder held in position by said insulating blocks, and meansconnected with said coils to-perm-it an electric current to flow through said coils to heat the same and thereby heat said cylinder.

4. A drier comprising a casing, a Shaft projecting therethrough for rotatably supporting the same, a plurality of spiders disposed adjacent one another within said cas mg and keyed to saidshaft, insulaging blocks secured inradial rows on said spi ers, a single wire. attached to all of said spiders and insulated therefrom by meansot said blocks, said wire coiled to form a flat spiral on each of said spiders to permit uniform heating of the air in said cylinder, and means connected with-the ends of said wire to permit an electric current to be passed therethroiigh.

In testimony whereof I have hereunto subscribed my name in the presence of. two subscribing witnesses.

I JOHN E. ALEXANDER.

Wi s;

Emu, M. Hannmn,

Crm'nms W. Hrnns, Jr. 

